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<div class="moz-cite-prefix">Hi Simon,</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Yes, we have very decent
reconstructions in the opposite direction.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">If you want to have a look, here is a
link towards the sinogram and the two geometry files:<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix"><a class="moz-txt-link-freetext" href="https://www.dropbox.com/sh/xtzof23ar89vutm/AAASZhDBcCez_c1BN2ed74H_a?dl=0">https://www.dropbox.com/sh/xtzof23ar89vutm/AAASZhDBcCez_c1BN2ed74H_a?dl=0</a></div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">I downsampled the projections so that
the file size remains reasonable.</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">Thank you very much for you help,</div>
<div class="moz-cite-prefix">Vincent<br>
</div>
<div class="moz-cite-prefix"><br>
</div>
<div class="moz-cite-prefix">On 27.08.20 17:02, Simon Rit wrote:<br>
</div>
<blockquote type="cite"
cite="mid:CAF0oig1EVeOf2TirGEyX3gw5X-qDhgHNNSWSjGOPaAPX--ZroA@mail.gmail.com">
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<div>Hi Vincent,</div>
<div>This sounds like a typical geometry problem. It's hard to
guess what could be the problem without data. Is it a system
for which you're able to reconstruct in the opposite
direction?</div>
<div>Simon<br>
</div>
</div>
<br>
<div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Thu, Aug 27, 2020 at 2:17
PM Vincent Libertiaux <<a href="mailto:vl@xris.eu"
moz-do-not-send="true">vl@xris.eu</a>> wrote:<br>
</div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px
0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Dear
RTK users,<br>
<br>
I am trying to reconstruct a volume using the opposite
rotation <br>
direction; I basically defined my rotation angle to be -360
degrees and <br>
my initial angle to be 359.6 (I have 900 projections).<br>
<br>
The results present artefacts, mostly important blurs compared
to the <br>
"original" reconstruction. To be sure I was not
misinterpreting the way <br>
rtk deals with the geometry, I performed the same
reconstruction with <br>
the "direct" rotation direction (from 0 to 359.6) but
reordering my <br>
projections instead, which yields in the same blurry results.<br>
<br>
I feel I am missing some basic understanding of what is
happening, any <br>
help you can provide would be much appreciated !<br>
<br>
Best regards,<br>
<br>
Vincent<br>
<br>
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</blockquote>
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